Plan a flight · Mon 9:49 am CDT (14:49 UTC)

Chicago Executive to Boeing Fld/King County International PWK → BFI

1,488 nautical miles (1,712 statute miles) northwest on a straight line, true course 294°, about 296° magnetic at the departure end (variation 2W). At 120 knots that is 12 h 50 min at the quickest height in today's winds (4,500 ft, a 4-knot headwind), arriving about 8:39 pm PDT (03:39 UTC), after sunset at the destination. Right now PWK is VFR, wind from the south-southwest (210°) at 6 knots; BFI is VFR, wind from the southeast (130°) at 3 knots. For planning, not a briefing: the legal preflight briefing comes from Flight Service (1-800-WX-BRIEF) or the FAA's own tools. Airlines fly this pair: 1 flights in the DOT's last twelve reported months, the route's page.

The route the straight line, the warnings crossed, restrictions, pilot reports and the airports along the way · click a mark for its words

Green, blue, red and purple airport dots are the flying conditions reported there now (VFR, marginal VFR, IFR, low IFR); grey means no report. Red areas are SIGMETs, orange areas AIRMETs, hatched red areas temporary flight restrictions. Map tiles: OpenFreeMap, data © OpenStreetMap contributors.

Warnings the route crosses SIGMETs and AIRMETs whose area the line passes through or comes within 25 nm of

SIGMET C20C: thunderstorms (a convective SIGMET) up to 37,000 ft, moving from the southwest at 40 knots, until 10:55 am CDT (15:55 UTC). Over the route from 579 to 579 nm out.
as issued
```
WSUS32 KKCI 121355
MKCC WST 121355
CONVECTIVE SIGMET 20C
VALID UNTIL 1555Z
SD ND
FROM 80W GFK-40WNW FAR-40W ABR-50ENE DPR-30S BIS-80W GFK
AREA TS MOV FROM 21040KT. TOPS TO FL370.
```
AIRMET SIERRA 4E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist). Over the route from 300 to 1118 nm out.
AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 789 to 859 nm out.
AIRMET ZULU 2C: moderate icing up to 18,000 ft. Over the route from 869 to 1298 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 929 to 1218 nm out.
AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the route from 1128 to 1438 nm out.

A SIGMET warns of weather hazardous to all aircraft; an AIRMET of weather that matters to small aircraft and to flying without instruments. "From 60 to 180 nm out" is measured along the route from PWK.

Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first

B39M at 36,000 ft, 7 nm north, 8:18 am CDT (13:18 UTC): no turbulence. At the departure end, 7 nm north of the line.
as filed, and in English
```
PWK UA /OV OBK/TM 1318/FL360/TP B39M/TB NEG
```
Report
a routine report filed through PWK
Where
over OBK
Time
13:18 UTC
Height
at 36,000 ft
Aircraft
B39M
Turbulence
none
C510 at 17,000 ft, 20 nm northeast, 8:27 am CDT (13:27 UTC): no turbulence. 120 nm along the route, 20 nm northeast of the line.
as filed, and in English
```
LNR UA /OV LNR/TM 1327/FL170/TP C510/TB NEG
```
Report
a routine report filed through LNR
Where
over LNR
Time
13:27 UTC
Height
at 17,000 ft
Aircraft
C510
Turbulence
none
PC12 at 20,000 ft, 20 nm northeast, 8:27 am CDT (13:27 UTC): no turbulence. 120 nm along the route, 20 nm northeast of the line.
as filed, and in English
```
LNR UA /OV 0WI4/TM 1327/FL200/TP PC12/TB NEG
```
Report
a routine report filed through LNR
Where
over 0WI4
Time
13:27 UTC
Height
at 20,000 ft
Aircraft
PC12
Turbulence
none
B752 at 34,000 ft, 30 nm southwest, 7:23 am CDT (12:23 UTC): light chop turbulence. 140 nm along the route, 30 nm southwest of the line.
as filed, and in English
```
DBQ UA /OV DBQ300020/TM 1223/FL340/TP B752/TB OCNL LGT CHOP
```
Report
a routine report filed through DBQ
Where
20 nm northwest (300°) of DBQ
Time
12:23 UTC
Height
at 34,000 ft
Aircraft
B752
Turbulence
occasional light chop
BE36 at 6,000 ft, 24 nm south, 8:12 am CDT (13:12 UTC): no turbulence. 300 nm along the route, 24 nm south of the line.
as filed, and in English
```
FRM UA /OV FRM/TM 1312/FL060/TP BE36/TB NEG
```
Report
a routine report filed through FRM
Where
over FRM
Time
13:12 UTC
Height
at 6,000 ft
Aircraft
BE36
Turbulence
none
SF50 at 13,000 ft, 13 nm northeast, 8:36 am CDT (13:36 UTC): no turbulence, no icing, clear from 13,000 ft to 60,000 ft. 349 nm along the route, 13 nm northeast of the line.
as filed, and in English
```
RWF UA /OV RWF/TM 1336/FL130/TP SF50/SK SKC/TB NEG/IC NEG
```
Report
a routine report filed through RWF
Where
over RWF
Time
13:36 UTC
Height
at 13,000 ft
Aircraft
SF50
Sky
clear
Turbulence
none
Icing
none
C25A at 7,500 ft, 14 nm northeast, 7:31 am CDT (12:31 UTC): no turbulence, no icing, remarks: during the climb. 439 nm along the route, 14 nm northeast of the line.
as filed, and in English
```
ATY UA /OV ATY/TM 1231/FL075/TP C25A/SK BASEUNKN/TB NEG/IC NEG/RM DURC
```
Report
a routine report filed through ATY
Where
over ATY
Time
12:31 UTC
Height
at 7,500 ft
Aircraft
C25A
Sky
baseunkn
Turbulence
none
Icing
none
Remarks
during the climb
C441 at 5,000 ft, 24 nm northeast, 6:52 am CDT (11:52 UTC): no turbulence, no icing, remarks: during the climb. 499 nm along the route, 24 nm northeast of the line.
as filed, and in English
```
ABR UA /OV ABR/TM 1152/FL050/TP C441/SK BASEUNKN-TOP032/TB NEG/IC NEG/RM DURC
```
Report
a routine report filed through ABR
Where
over ABR
Time
11:52 UTC
Height
at 5,000 ft
Aircraft
C441
Sky
BASEUNKN-TOP032
Turbulence
none
Icing
none
Remarks
during the climb
A21N at 34,000 ft, 50 nm north, 9:34 am CDT (14:34 UTC): a routine report with nothing remarked on. 579 nm along the route, 50 nm north of the line.
as filed, and in English
```
BIS UA /OV BIS130040/TM 1434/FL340/TP A21N/SK TOP360
```
Report
a routine report filed through BIS
Where
40 nm southeast (130°) of BIS
Time
14:34 UTC
Height
at 34,000 ft
Aircraft
A21N
Sky
TOP360
A321 at 35,000 ft, 6 nm north, 8:38 am CDT (13:38 UTC): no turbulence. 579 nm along the route, 6 nm north of the line.
as filed, and in English
```
MBG UA /OV MBG/TM 1338/FL350/TP A321/SK TOP310/TB NEG
```
Report
a routine report filed through MBG
Where
over MBG
Time
13:38 UTC
Height
at 35,000 ft
Aircraft
A321
Sky
TOP310
Turbulence
none
SR22 at 7,000 ft, 45 nm north, 8:37 am CDT (13:37 UTC): no turbulence, no icing, clear from 7,000 ft to 60,000 ft. 599 nm along the route, 45 nm north of the line.
as filed, and in English
```
BIS UA /OV BIS170030/TM 1337/FL070/TP SR22/SK SKC/TB NEG/IC NEG
```
Report
a routine report filed through BIS
Where
30 nm south (170°) of BIS
Time
13:37 UTC
Height
at 7,000 ft
Aircraft
SR22
Sky
clear
Turbulence
none
Icing
none
DC3T at 8,500 ft, 25 nm north, 9:03 am CDT (14:03 UTC): light to moderate rime icing above 8,000 ft, -8 °C. 1048 nm along the route, 25 nm north of the line.
as filed, and in English
```
GTF UA /OV 300025/TM 1403/FL085/TP DC3T/TA M8/IC LGT-MOD RIME 080
```
Report
a routine report filed through GTF
Where
wind from 300° at 25 knots
Time
14:03 UTC
Height
at 8,500 ft
Aircraft
DC3T
Temperature
−8 °C
Icing
light to moderate rime at 8,000 ft
A319 at 7,500 ft, 25 nm north, 8:41 am CDT (13:41 UTC): overcast from 30,000 ft to 7,500 ft. 1048 nm along the route, 25 nm north of the line.
as filed, and in English
```
GTF UA /OV 180010/TM 1341/FL075/TP A319/SK OVC003-TOPS075
```
Report
a routine report filed through GTF
Where
wind from 180° at 10 knots
Time
13:41 UTC
Height
at 7,500 ft
Aircraft
A319
Sky
overcast from 300 ft, tops 7,500 ft
BE9L at 7,500 ft, 34 nm south, 7:45 am CDT (12:45 UTC): no turbulence, light rime icing, overcast from 7,500 ft to 9,000 ft, -6 °C, remarks: during the climb. 1058 nm along the route, 34 nm south of the line.
as filed, and in English
```
HLN UA /OV HLN120010/TM 1245/FL075/TP BE9L/SK OVC075-TOPS090/TA M06/TB NEG/IC LGT RIME/RM DURC
```
Report
a routine report filed through HLN
Where
10 nm southeast (120°) of HLN
Time
12:45 UTC
Height
at 7,500 ft
Aircraft
BE9L
Sky
overcast from 7,500 ft, tops 9,000 ft
Temperature
−6 °C
Turbulence
none
Icing
light rime
Remarks
during the climb

4 more routine reports are on the map.

Winds aloft along the route, and the time en route the forecast for use 14:00–21:00 UTC · at 120 knots true airspeed

The westbound cruising heights for this course (VFR: even thousands plus 500 ft; above 18,000 ft the forecast levels), with the wind averaged along the line from the 16 forecast points nearest it (JOT, DBQ, LSE, MCW, MSP, FSD, ABR, PIR, DIK, MLS, BIL, GTF, GPI, GEG, YKM, SEA). A plus sign is a headwind, a minus sign a tailwind.

Height	Average wind	Head- or tailwind	Temperature	Ground speed	Time en route	Arrival
4,500 ft	260° at 6 kt	+4 kt	0 °C	116 kt	12 h 50 min	8:39 pm PDT (03:39 UTC)
6,500 ft	250° at 7 kt	+5 kt	7 °C	115 kt	12 h 56 min	8:45 pm PDT (03:45 UTC)
8,500 ft	240° at 10 kt	+7 kt	5 °C	113 kt	13 h 10 min	8:59 pm PDT (03:59 UTC)
10,500 ft	250° at 13 kt	+9 kt	2 °C	111 kt	13 h 24 min	9:13 pm PDT (04:13 UTC)
12,500 ft	250° at 15 kt	+10 kt	-1 °C	110 kt	13 h 32 min	9:21 pm PDT (04:21 UTC)
14,500 ft	250° at 15 kt	+11 kt	-6 °C	109 kt	13 h 39 min	9:28 pm PDT (04:28 UTC)
16,500 ft	250° at 16 kt	+11 kt	-10 °C	109 kt	13 h 39 min	9:28 pm PDT (04:28 UTC)
18,000 ft FL180	250° at 16 kt	+12 kt	-13 °C	108 kt	13 h 47 min	9:36 pm PDT (04:36 UTC)
24,000 ft FL240	250° at 21 kt	+15 kt	-25 °C	105 kt	14 h 10 min	9:59 pm PDT (04:59 UTC)
30,000 ft FL300	250° at 26 kt	+21 kt	-36 °C	99 kt	15 h 02 min	10:51 pm PDT (05:51 UTC)
34,000 ft FL340	250° at 33 kt	+27 kt	-39 °C	93 kt	16 h	11:49 pm PDT (06:49 UTC)
39,000 ft FL390	250° at 42 kt	+34 kt	-44 °C	86 kt	17 h 18 min	1:07 am PDT (08:07 UTC)

Based on data from the 12th at 12:00 UTC; valid on the 12th at 18:00 UTC for use 14:00 to 21:00 UTC; temperatures above 24,000 ft are below zero. Heights are above sea level; a height is left out when the forecast has no wind for it over most of the line (the ground is higher). Ground speed is the airspeed less the headwind; the time en route is for the straight line and ignores climb, descent and routing around weather.

The forecast points as issued

Point	From	3,000	6,000	9,000	12,000	18,000	24,000	30,000	34,000	39,000
JOT	used from 0 nm out; 47 nm from the line	230/30	250/26 16°	270/27 11°	280/34 5°	290/32 -8°	280/37 -21°	280/40 -36°	290/46 -37°	290/56 -47°
DBQ	used from 50 nm out; 57 nm from the line	250/26	240/32 19°	250/35 11°	260/37 5°	270/35 -9°	270/40 -21°	270/43 -35°	280/49 -37°	280/58 -46°
LSE	used from 150 nm out; 39 nm from the line	240/16	230/27 20°	250/35 12°	260/28 5°	260/30 -9°	260/37 -21°	260/38 -36°	280/44 -37°	280/52 -47°
MCW	used from 200 nm out; 40 nm from the line	220/19	210/29 20°	230/35 13°	250/35 5°	250/33 -9°	260/44 -21°	260/46 -33°	270/58 -37°	270/59 -46°
MSP	used from 300 nm out; 79 nm from the line	140/8	210/22 19°	230/31 13°	240/31 5°	240/29 -9°	250/34 -21°	250/38 -36°	260/46 -38°	270/55 -47°
FSD	used from 349 nm out; 63 nm from the line	260/9	210/16 18°	220/27 14°	230/28 6°	240/39 -9°	240/48 -22°	260/52 -32°	260/61 -38°	260/60 -46°
ABR	used from 449 nm out; 33 nm from the line	020/9	230/5 12°	190/14 11°	200/25 5°	230/37 -11°	230/50 -23°	240/39 -34°	240/49 -38°	240/55 -46°
PIR	used from 549 nm out; 63 nm from the line		300/15 10°	270/10 10°	220/18 4°	220/36 -11°	230/43 -21°	240/48 -33°	240/51 -37°	240/55 -44°
DIK	used from 599 nm out; 88 nm from the line		330/11 1°	230/20 4°	220/22 0°	230/29 -12°	240/27 -25°	240/40 -34°	230/49 -37°	240/55 -44°
MLS	used from 749 nm out; 40 nm from the line		320/9 -2°	270/14 0°	260/22 -1°	220/30 -14°	210/43 -26°	230/53 -34°	230/54 -38°	230/59 -44°
BIL	used from 899 nm out; 55 nm from the line		L/V	250/11 -1°	240/20 -2°	230/28 -15°	220/28 -28°	220/53 -34°	220/55 -39°	220/63 -44°
GTF	used from 949 nm out; 77 nm from the line		L/V	L/V -4°	230/12 -3°	210/12 -17°	190/23 -29°	200/48 -39°	210/69 -39°	220/66 -42°
GPI	used from 1098 nm out; 76 nm from the line		L/V -3°	L/V -4°	L/V -6°	210/19 -17°	220/26 -32°	190/23 -40°	220/25 -39°	220/34 -42°
GEG	used from 1198 nm out; 73 nm from the line		060/10 -2°	050/11 -3°	050/9 -8°	050/27 -19°	040/26 -31°	030/32 -39°	020/19 -41°	L/V -42°
YKM	used from 1348 nm out; 71 nm from the line	L/V	350/9 0°	040/20 -5°	030/23 -8°	020/41 -18°	010/74 -27°	010/73 -40°	020/54 -44°	350/9 -43°
SEA	used from 1448 nm out; 21 nm from the line	L/V	L/V 1°	020/13 -2°	020/27 -4°	010/43 -14°	360/54 -26°	360/63 -40°	010/60 -48°	350/39 -50°

The weather now: both ends and the airports along the way public airports with a weather report within 25 nm of the line, one for each stretch

Airport	Where	Conditions	Wind	Visibility	Ceiling	Elevation	Reported
PWK Chicago/Prospect Heights/Wheeling, IL	departure	VFR Sky: scattered clouds at 9,500 feet, scattered clouds at 11,000 feet	from the south-southwest (210°) at 6 knots	10+ mi	none	644 ft	8:52 am CDT (13:52 UTC)
JVL Janesville, WI	60 nm out, 7 nm northeast of the line, tower	VFR Sky: scattered clouds at 23,000 feet	from the southwest (230°) at 12 knots	10+ mi	none	807 ft	14:45 UTC
RST Rochester, MN	230 nm out, 21 nm northeast of the line, tower	VFR	from the south (190°) at 11 knots	7 mi	none	1,317 ft	13:54 UTC
MML Marshall, MN	369 nm out, 4 nm northwest of the line	low IFR Sky: overcast at 300 feet Weather: fog	from the north (360°) at 3 knots	0.5 mi	300 ft	1,182 ft	14:33 UTC
MBG Mobridge, SD	579 nm out, 6 nm north of the line	marginal VFR Sky: scattered clouds at 800 feet, overcast at 1,200 feet	from the north-northwest (340°) at 5 knots	7 mi	1,200 ft	1,716 ft	14:33 UTC
HEI Hettinger, ND	679 nm out, 9 nm northeast of the line	marginal VFR Sky: a few clouds at 400 feet, overcast at 1,500 feet	from the north (360°) at 9 knots	9 mi	1,500 ft	2,705 ft	14:39 UTC
MLS Miles City, MT	809 nm out, 5 nm northwest of the line	IFR Sky: a broken layer at 700 feet, overcast at 1,600 feet	from the northwest (320°) at 11 knots	10+ mi	700 ft	2,634 ft	14:30 UTC
LWT Lewistown, MT	968 nm out, 13 nm northeast of the line	no report just now				4,170 ft
MSO Missoula, MT	1148 nm out, 20 nm south of the line, tower	VFR Sky: overcast at 6,500 feet	from the north (350°) at 3 knots	10+ mi	6,500 ft	3,205 ft	13:53 UTC
GEG Spokane, WA	1298 nm out, 11 nm north of the line, tower	VFR Sky: scattered clouds at 3,800 feet, a broken layer at 8,000 feet, a broken layer at 11,000 feet	from the east (100°) at 9 knots	10+ mi	8,000 ft	2,385 ft	13:53 UTC
MWH Moses Lake, WA	1368 nm out, 17 nm south of the line, tower	VFR	from the north (010°) at 4 knots	10+ mi	none	1,188 ft	13:52 UTC
BFI Seattle, WA	destination	VFR	from the southeast (130°) at 3 knots	10+ mi	none	21 ft	6:53 am PDT (13:53 UTC)

The highest airport on this list sits at 4,170 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At BFI when you get there the forecast at the estimated arrival, 8:39 pm PDT (03:39 UTC)

Wind calm, visibility more than 6 miles, scattered clouds at 25,000 feet VFR

The whole forecast for BFI

From Mon 5:00 am PDT (12:00 UTC): wind light and variable, visibility more than 6 miles, clear skies
From Mon 12:00 pm PDT (19:00 UTC): wind from the west-southwest at 4 knots, visibility more than 6 miles, clear skies
From Mon 2:00 pm PDT (21:00 UTC): wind from the west-northwest at 5 knots, visibility more than 6 miles, clear skies
From Mon 8:00 pm PDT (03:00 UTC): wind calm, visibility more than 6 miles, scattered clouds at 25,000 feet
From Tue 4:00 am PDT (11:00 UTC): wind from the south-southeast at 4 knots, visibility more than 6 miles, overcast at 10,000 feet

Temporary flight restrictions on the line or within 25 nm of it

6/8927 Kalispell, MT, Wednesday, October 14, 2026 through Wednesday, October 14, 2026 Local on the route, 1138 nm along the route · a VIP movement · starts Wednesday 14 October · ZSE
6/8923 Kalispell, MT, Wednesday, October 14, 2026 through Wednesday, October 14, 2026 Local on the route, 1138 nm along the route · a VIP movement · starts Wednesday 14 October · ZLC

Daylight

Sunset at PWK 6:15 pm CDT (23:15 UTC), at BFI 6:25 pm PDT (01:25 UTC) (civil twilight ends 6:56 pm PDT (01:56 UTC)). At 120 knots the arrival at BFI is after sunset there (6:27 pm PDT (01:27 UTC)).

Each restriction opens the FAA's own page with the exact area, heights and times. Ordinary notices to air missions (closed runways, lights out) are not shown: the FAA's notice search is not open to sites like this one at this time.

Radar and forecast charts for the regions crossed government pictures, the latest each time the page loads

Radar now, the upper Mississippi valley · loop National Weather Service

Radar now, the northern Rockies · loop National Weather Service

Radar now, the Pacific Northwest · loop National Weather Service

Radar, the whole country · loop National Weather Service

Surface analysis now Weather Prediction Center

Forecast chart, 12 hours ahead Weather Prediction Center

Forecast chart, 24 hours ahead Weather Prediction Center

Sources: the Aviation Weather Center's data service (SIGMETs, AIRMETs, graphical AIRMETs, pilot reports, winds and temperatures aloft, observations and terminal forecasts), the National Weather Service radar, the Weather Prediction Center's charts, the FAA's temporary flight restriction list and shapes, and the FAA's airport file for the positions, elevations and magnetic variation. Fetched when the page is viewed and kept a few minutes. Each leg is the straight line between its two airports; airways, terrain and airspace are not considered. The airports in detail: Chicago Executive, Boeing Fld/King County International.